A Kinematical Analysis of SS433 after Two Observing Seasons 1978-1979

Details A Kinematical Analysis of SS433 after Two Observing Seasons 1978-1979 A Kinematical Analysis of SS433 after Two Observing Seasons 1978-1979

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....94..251c&link_type=abstract

Astronomy and Astrophysics, Vol. 94, P. 251, 1981

Astronomy and Astrophysics

Astrophysics

25

Scientific paper

The unique object SS433, X-ray and radio source located inside the peculiar SNRW 50, is mainly characterized by systems of emission lines which widely move in its spectrum, with a periodicity of 165d5 We present new spectroscopic observations obtained at Asiago, which have covered till now three cycles of the phenomenon, and revealed many superposed irregular variations of the moving features both in intensity and wavelength. The observations are discussed in order to define the proper correlation between red- and blue-shifted line systems, also in view of the established presence of double or multiple emissions in both branches.
Moreover, a kinematical analysis is carried out from all the available observations of SS433, under the hypotheses of outflowing or free falling beams from/to the collapsed precessing object. We thus derive with a good accuracy the "mean" parameters of the system as β=0.256±0.002, i=78°7±0°.1, θ=20°.3±0°.2 or β=0.184±0.001, l=72°.9±0°.2, θ=20°.8±0°.4 in the two cases. When considering the actual velocity and direction of the jets from individual observations, a wide scatter from these parameters results, indicating the presence of different moving blobs of matter at a given time.
Models of SS433 are finally reviewed, and constraints are imposed to them according to our analysis of the observational data.

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